Sears RoadTalker's are an excellent Vintage CB radio,
Unit is 40 years old and works GREAT!
FYI, On the back of this particular model, the lower power terminal is positive and the upper power terminal is negative.
I hooked it up in the minivan and put a Wilson magnetic antenna on the roof and got a strong and clear reception report. I like the features such a SWR calibration and switchable Noise Limiter. Sears RoadTalkers are very good CB Transceivers